Japan Data API

curl -X GET "https://api.nihonbase.com/api/v1/prefectures" \
  -H "X-API-Key: YOUR_API_KEY"

{
  "success": true,
  "data": [
    { "id": 1, "name": "Hokkaido", "name_ja": "北海道", "region_id": 1 },
    { "id": 2, "name": "Aomori", "name_ja": "青森県", "region_id": 2 },
    ...
  ]
}